6 720 611 449 GB (03.11)
32
Individual settings
7
Individual settings
7.1
Mechanical settings
7.1.1
Checking the size of the expansion vessel
Maximum pressure at maximum CH flow temperature is
2.5 bar. If the pressure is greater than this then fit an
extra expansion vessel. Refer to table 11.
System Capacity – BS7074:1
7.1.2
Setting the central heating flow tempera-
ture
The central heating flow temperature can be set to
between 35°C and 88 °C.
Limited maximum setting for low-temperature
operation
The temperature control is factory limited to setting
E
,
giving a maximum flow temperature of 75 °C.
Adjustment of the heating output to the calculated heat
demand is not required by the heating systems regula-
tions.
Removing the maximum setting limit
For heating systems which require higher flow tempera-
tures, the maximum setting limit can be removed.
B
Lift off the yellow button on the temperature control
with a screwdriver.
Fig. 40
B
Rotate yellow button through 180° and replace (dot
facing inwards).
The CH flow temperature is no longer limited.
7.2
Settings on the Bosch Heatronic
7.2.1
General description
The text display module provides a convenient means of
setting various appliance functions.
This description is limited to those functions necessary
for commissioning.
Displaying service functions
All service functions are displayed.
B
Press any button to activate the main menu.
B
Press
or
button until the arrow cursor is
pointing to
Settings
.
B
Press the
button.
B
Press
or
button until the arrow cursor is
pointing to
Service
.
B
Press the
button.
B
Press the
button to select
Display service
parameters
.
Service function
0.0, Last fault
is displayed.
B
Press the
or
button to cycle through the
current settings.
B
Press the
button to exit the menu.
Setting service functions
Only the service functions that can be set are displayed.
Expansion Vessel Pressure and System
Capacity
Expansion Vessel
litres
10
Expansion Vessel Charge
Pressure
bar
0.75
System
pressure and
capacity
1 bar
litres
82
1.5 bar
litres
46
Table 11
i
With underfloor heating systems, observe
the maximum permissible flow tempera-
tures.
6 720 610 332-27.1O
Control setting
CH flow temperature
1
approx. 35°C
2
approx. 43°C
3
approx. 51°C
4
approx. 59°C
5
approx. 67°C
E
approx. 75 °C
max
approx. 88°C
Table 12
Service function
Code no.
see
page
Anti-cycle time
2.4
33
Max. CH flow temp.
2.5
33
Max. heating output
5.0
33
Variable pump settings
7.0
33
Table 13
i
For a detailed description, refer to Service
Booklet for the Engineer 7 181 465 347.
